1. To be presented at Engineering Foundation Conference on “The impact of ash deposition on coal fired plant”;Joutsensaari,1993
2. Tenth Particulate Controll Symposium;Kauppinen,1993
3. European Aerosol Conference;Lehtinen,1992
4. To be presented at Engineering Foundation Conference on “The impact of ash deposition on coal fired plant”;Lind,1993